The cyanobacteria are also referred to as

Options

A. proists
B. golden algae
C. Slime moulds
D. blue green algae

Answer

### Step-by-Step Solution:

1. **Understanding Cyanobacteria**:
- Cyanobacteria are a group of photosynthetic bacteria that are often found in aquatic environments. They are known for their ability to perform photosynthesis and produce oxygen.

2. **Classification of Cyanobacteria**:
- Cyanobacteria are classified under the kingdom Monera, which includes prokaryotic organisms. They are distinct from other algae which are eukaryotic.

3. **Identifying Alternative Names**:
- Cyanobacteria are commonly referred to as "blue-green algae" due to their color and photosynthetic capabilities. This term is somewhat misleading as they are not true algae but are more closely related to bacteria.

4. **Evaluating the Options**:
- Option 1: Protist - This is incorrect as cyanobacteria are not classified under protists.
- Option 2: Golden algae - This is also incorrect; golden algae refer to a different group of organisms.
- Option 3: Slime molds - This is incorrect; slime molds are a different category of protists.
- Option 4: Blue-green algae - This is correct as cyanobacteria are indeed referred to as blue-green algae.

5. **Conclusion**:
- The correct answer is that cyanobacteria are also referred to as "blue-green algae".